Door frame of plastics for room doors



Aprll 28, 1964 1 BoRLENGl-n DooR FRAME oF PLASTICS FOR RooM DooRs FiledJune 20, 1962 2 Sheets-Sheet 1 FIGJ L. BORLENGHI DOOR FRAME OF PLASTICSFOR ROOM DOORS April 28, 1964 Filed Jue 20, 1962 2 Sheets-Sheet 2 UnitedStates Patent O 3,130,455 Dfi-R FRAPE 0I? PLASTICS FR EGSM DRS LorenzoBerlenghi, Milaan, Italy, assigner to Etahiissement Sabor, Esehen,Liechtenstein Filed .inne 2t?, i962, Ser. No. 293,529 Claims priority,appiieation italy Aug. 30, 1961 2 Claims. CL L20- 11) This inventionrelates to a frame of plastic for room doors, which is readilyattachable to the door case previously anchored in its respectiveyaperture in a Wall thereby fully covering the junction of the plasterand case.

The main characteristic feature of the improved frame resides in thefact that the two uprights and top beam comprise each a channel-memberof plastic (such as polyvinyl chloride) which engages by resilientdeformation and snap action achoring means secured to the door case.

The invention will be described in detail with reference to thedrawings, wherein:

FIG. l is a diagrammatical elevational View of a room door provided withthe improved frame,

FIG. 2 is a cross sectional view of a channel-member of plastics formingthe frame in its inoperative condition before assembly,

FIG. 3 is a cross sectional part-view on an enlarged scale on lineIIL-III of FIG. 1, showing the frame in its assembled condition, and

FIGURES 4 and 5 are modifications of the structure shown in FIG. 3.

The frame for room doors comprises two uprights and a horizontal topbeam, each made from an extruded channel-member of resilient plasticscut to length, the cross section of which in an inoperative conditionbefore assembly is shown in FIG. 2. The channel member comprises a websection 1 and a pair of wings 2. An inwardly turned hook-shaped flange 3is formed on the free edge of each of the wings 2. The web section 1 isformed with a step 4 imparting to the section a saw-tooth prole. Thestep 4 provides an abutment for a door panel.

I1 disassembled condition of the member the web section 1 is of aslightly inwardly bowed profile by an extent A with respect to thereference plane denoted by L connecting the corners of the member. Theangles B formed by the wings 2 with respect to the plane L are smallerthan 90.

Reference C denotes a wooden member of a door case cemented in a wall M,the latter being covered by layers I of plaster.

The anchoring means shown in FIG. 3 comprises a double frame formed bylongitudinally extending anchoring strips 5 of pressed Wood fiber or thelike, secured by means of nails or screws 6 to the opposite sides of thedoor case C to cover the junction between the case and plaster layers I.The two strips 5 are interconnected by a bridging strip '7 of plywood orpressed wood fibers whereby a kind of underframe is formed.

The strips 5 and bridging strip 7 are preferably secured to the doorcase C with the aid of a jig or model accurately reproducing thedimensions of the door frame.

The strips 5 are each undercut at 5a to provide a recess for snapengagement by the anges 3 on the channel member of plastic which is ttedon the nnderframe and is resiliently deformed from its original shape toresiliently close around the strips 5 and bridging strip 7. In thismanner the originally bowed web section of the channel memberstraightens up by the extent A whereby the step 4 finds a iirm supporton the bridging strip 7.

Shims are preferably interposed between the bridging strip 7 and doorcase C at the region of the door hinges.

The assembly of the channel members of plastics on Patented Apr. 2S,1964 ice the underframe is easily and readily accomplished even byunskilled workers.

According to the modiication shown in FIG. 4 the anchoring structure forthe frame comprises a strip 11 of plywood or the like curved to achannel-profile substantially matching the inner shape of the channelmember of plastics. The wings of the channel-formed wooden strip 11 arenailed to the case member C by means of nails 14 through interpositionof shims 12 in the form of strips or spaced lugs providing between eachof the edges of the strip 11 and plastered wall a recess 13 into whichthe respective hooked flange 3 snappingly engages on assembly.

According to the modification shown in FIG. 5 the anchoring structurecomprises two wooden strips 5 and a bridging strip 7, as in the case ofFIG. 3. An inward step 5a, 5b is formed in each longitudinal edge ofeach strip 5 and the outer faces of the latter are symmetrically roundedin cross-sectional prolile, as indicated by 5c.

The step 5a serves for anchoring the flange 3 of the channel member ofplastic, the opposite step 5b having the bridging strip 7 bearingthereon, which may, if desired, be secured to the door case C by anumber of nails 8.

The rounded portions 5c on the strips provide a dimensional allowancebetween the channel member of plastic and the underfrarne on assembly.

The whole cross-sectional profile of the strips 5 is advantageouslysymmetrical with respect to a mid-plane (as embodied by nails 6 in FIG.5), whereby no trouble arises as to the right orientation of the stripson assembly.

What I claim is:

1. In combination with a door case member framing an aperture in a wall,an underframe structure providing a pair of continuous anchoring stripson opposite sides of the wall secured to and extending lengthwise of themember, said anchoring strips each having a recess along the edgethereof adjacent the wall, and an extruded channel member of resilientplastic iitted on the underframe structure, said channel membercomprising a web section, a pair of wings integral with the web sectioneach including an inwardly turned hooked ange engaged over therespective anchoring strip in the recess therein, and a saw-tooth-likestep formed on the web section lengthwise of the latter providing astop-abutment for a door panel; said wings being of a length equal tothe width of the continuous strips, and said wings each forming an acuteangle with the plane passing through the two corners of the channelmember and said web section being inwardly bowed with respect of saidplane in disassembled condition of the channel member with respect ofthe underframe structure, whereby the channel member is resilientlydeformed in assembled condition and the anges are snappingly engaged insaid recesses.

2. The combination defined in claim 1 wherein said anchoring strips aredisposed in an arrangement to cover the junction between the door casemember and the Wall, and -a bridging strip extending between saidanchoring strips and rigidly secured thereto, the bridging stripproviding a support for the web section of the channel member.

References Cited in the le of this patent UNITED STATES PATENTS2,209,375 Anderson July 30, 1940 2,562,105 Lang July 24, 1951 3,001,246Mather Sept. 26, 1961 FOREIGN PATENTS 542,568 Belgium Nov. 30, 1955877,294 Great Britain Sept. 13, 1961

1. IN COMBINATION WITH A DOOR CASE MEMBER FRAMING AN APERTURE IN A WALL,AN UNDERFRAME STRUCTURE PROVIDING A PAIR OF CONTINUOUS ANCHORING STRIPSON OPPOSITE SIDES OF THE WALL SECURED TO AND EXTENDING LENGTHWISE OF THEMEMBER, SAID ANCHORING STRIPS EACH HAVING A RECESS ALONG THE EDGETHEREOF ADJACENT THE WALL, AND AN EXTRUDED CHANNEL MEMBER OF RESILIENTPLASTIC FITTED ON THE UNDERRAME STRUCTURE, SAID CHANNEL MEMBERCOMPRISING A WEB SECTION, A PAIR OF WINGS INTEGRAL WITH THE WEB SECTIONEACH INCLUDING AN INWARDLY TURNED HOOKED FLANGE ENGAGED OVER THERESPECTIVE ANCHORING STRIP IN THE RECESS THERIN, AND ASAW-TOOTH-LIKESTEP FORMED ON THE WEB SECTION LENGTHWISE OF THE LATTERPROVIDING A STOP-ABUTMENT FOR A DOOR PANEL; SAID WINGS BEING OF A LENGTHEQUAL TO THE WIDTH OF THE CONTINUOUS STRIPS, AND SAID EACH FORMING ANACUTE ANGLE WITH THE PLANE PASSING THROUGH THE TWO CORNERS OF THECHANNEL MEMBER AND SAID WEB SECTION BEING INWARDLY BOWED WITH RESPECT OFSAID PLANE IN DISASSEM-